Morphology of CMB fields—effect of weak gravitational lensing

摘要: We study the morphology of cosmic microwave background temperature and polarization fields using shape alignment parameters, β α, that are constructed from contour Minkowski tensor. The primary goal our paper is to understand effect weak gravitational lensing on CMB fields. In order isolate different physical effects can be potentially confused with lensing, we first varying cosmology α β, show they relatively insensitive variation cosmological parameters. Next analyze signatures hemispherical anisotropy, information such anisotropy in gets washed out at small angular scales become pronounced only large scales. For find characteristic distortions which vary field threshold. then simulations lensed E B modes. quantify distortion induced across makes structures all increasingly more anisotropic as probe down smaller distinct behaviour morphological a function threshold for mode, while it significantly mode. Further, does not induce statistical expected isotropic distribution scale structure matter. expect results obtained this work will provide insights reconstruction potential.